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Image Resize

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Ok so I have it set so your user image you chose to upload, it resizes in the forum, just so it isn't huge and makes the forum look goofy.. yet I've come across a problem I can not fix. The script resizes all JPEG images, but it won't resize PNG or GIF, which are the other extensions I'm allowing. Can someone tell me if I have a flaw in my script, because I'm just confused?

if (isset($_GET['img'])) {
$img_name = $_GET['img'];
$width_ratio=($size[0] / $max_width);
$height_ratio =($size[1] / $max_height);
$new_width=($size[0] / $ratio);
$new_height=($size[1] / $ratio);
header("Content-Type: image/jpeg, image/gif, image/png");
if ($file_type="image/pjpeg"||$file_type="image/jpeg") {
$src_img = imagecreatefromjpeg($img_name); }
elseif ($file_type="image/x-png"||$file_type="image/png") {
$src_img = imagecreatefrompng($img_name); }
elseif ($file_type="image/gif") {
$src_img = imagecreatefromgif($img_name); }
$thumb = imagecreatetruecolor($new_width,$new_height);
imagecopyresampled($thumb, $src_img, 0,0,0,0,($new_width),($new_height),$size[0],$size[1]);

Like I said, it resizes JPEGs just fine, and they're good to go, but the others won't work.

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Well I figured out that I can't use $_FILES because I'm not taking it from a form or input.. therefore I can't take the type from the image.. any other ideas on how I can tell what the file type is?

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